Ignore DeprecationWarning caused by instantiating path on python2.6

Python2.6's class hierarchy is a bit different than 2.7 and the basic
init line causes a DeprecationWarning:

path.py:114: DeprecationWarning: object.__init__() takes no parameters
  super(path, self).__init__(self, other)

Add a warnings.simplefilter to ignore it as everything works fine
anyways.